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Physics

Physics
The unit of noise pollution (level) is :

Ppm
None of these
Decimal
Decibel

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Physics
If an empty cylinder is half filled with a liquid, its center of gravity is

Shifted upward or downward depending on the density of the liquid
Shifted upwards
Shifed neither upward nor downward
Shifted downwards

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Physics
The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes?

2.0958333333333
0.12847222222222
1.0479166666667
0.21041666666667

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Physics
An ice block with a piece of lead embeded in it floats in water. If ice melts the water level

Rises
Falls first and then rises
Remains same
Falls

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Physics
A device used for converting a.c. into d.c. is called

Induction coil
Dynamo
Rectifier
Transformer

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Physics
Which one of the following determines the sharpness of image in a camera ?

Size of the camera
The focal length of the lens
The aperture
The exposure time

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